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I want to make a small app that displays a PDF, presenting zoom-able single pages with a previous-next page function.
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Adobe Acrobat Reader One of the preferred choices to read PDF ebooks on Android. The app supports 18:9 displays and other aspect ratios. It allows you to edit the PDF, take notes, fill out forms, and add your signature. It also provides some amount of cloud storage support.
Safari has a built-in PDF reader that automatically displays PDF documents right in the browser window. You don't have to download and install a separate PDF reader app. Open Safari for me.
The Core Graphics API is pretty much the same in Cocoa and Cocoa touch. Read up on CGPDFDocument, it should provide you with everything you will need to render PDF pages. You won't need to read the PDF spec or use a library to parse PDF files directly. You will probably to learn more about Core Graphics / Quartz 2D / etc. to understand how to use those functions inside of a Cocoa app.
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